In this study, contribution evaluation method applying Independent Component Analysis (ICA) was proposed. The necessity of applying ICA to the contribution evaluation was investigated through numerical simulation. The simulation modeled a scenario where the vibration/noise sources were physically overlapped in a small space, and their frequency characteristics were similar. For comparison between the conventional contribution evaluation method and the proposed method, the contribution evaluation was performed using the ordinary and partial contribution evaluation methods. Through this analysis, it was confirmed that the proposed method can identify contributions by restoring the signal when the frequency characteristics of the vibration/noise sources were similar, and their positions overlapped. These results confirm that the contribution evaluation method based on independent component analysis is effective in appropriately analyzing vibration/noise sources when their frequency characteristics are similar, and their positions overlap.

Abstract
1. 서 론
2. 기여도 평가 방법
    2.1 Ordinary Coherence Function (OCF)
    2.2 Partial coherence function (PCF)
3. ICA 기반 기여도 평가
    3.1Independent Component Analysis (ICA)
    3.2 ICA 기반 기여도 평가
4. 결 론
References

• 정운창(School of ICT, Robotics & Mechanical Engineering, Hankyong National University) | Un-Chang Jeong Corresponding author